Bring a large pot of lightly salted water to a boil over high heat. Add the spaghetti and cook until al dente, about 10 minutes. Drain the spaghetti, rinse under cold running water, and drain again. In a large serving bowl, whisk together the water, soy sauce, canola oil, vinegar, sesame oil, ginger, sugar, and…
Bring a large pot of lightly salted water to a boil over high heat. Add the spaghetti and cook until al dente, about 10 minutes. Drain the spaghetti, rinse under cold running water, and drain again. In a large serving bowl, whisk together the water, soy sauce, canola oil, vinegar, sesame oil, ginger, sugar, and garlic until blended.
Add the pasta, ¾ cup of the cucumber, ½ cup each of the radishes and carrot, 3 tablespoons of the scallions, and 2 tablespoons of the peanuts and toss to combine. Top the salad with the remaining cucumber, radishes, carrots, scallions, and peanuts. Season with the red pepper flakes and serve.